AT521147B1 - Sliding protective cover - Google Patents

Abstract

The invention relates to a sawing device for cutting wood comprising at least one saw blade (3) and a workpiece holder (1) with a cutting space (13) for inserting sawing material, - wherein the workpiece holder (1) between one of the cutting edge of the saw blade (3) distant Rest position and one of the cutting edge of the saw blade (3) near sawing position movably arranged, in particular pivotable or displaceable is, - where on the workpiece holder (1) a protective cover (2) for at least partially covering the cutting chamber (13) is arranged, - both in the rest position as well as in the sawing position the access to the cutting space (13) is at least partially permanently covered by the protective covering (2) and - wherein the protective covering (2) is at least partially displaceable along the longitudinal extension of the cutting space (13).

Description

The invention relates to a sawing device for cutting wood according to the preamble of claim 1.

The operation of sawing devices, for example for cutting firewood, harbors risks for the user of the sawing device, since there is a considerable risk of injury from the saw blade, in particular the risk of serious hand injuries, such as amputations of individual fingers or parts of the arm. Accidents with such devices are due to errors in maintenance as well as improper use. For this reason, sawing devices of this type, such as circular saws, have already been the subject of standardization processes with the aim of reducing the process potential emanating from these machines. Current requirements for sawing devices are defined in accordance with E standard EN 1870-6: 2017.

From the prior art are sawing devices with different protective covers for protection for the user, for example from FR 985510 A, DE 8024996 U1, DE 102014108998 A1, DE 102010014996 A1, EP 1992461 A1, DE 202010017503 U1 and known from DE 202006010777 U1.

Sawing devices are known from the prior art, which are equipped with safety devices in accordance with this E standard in order to rule out the risk, for example, of a hand injury from the saw blade or the material to be cut in the cutting area. Such a sawing device is disclosed, for example, in EP 1 992 461 B1, in which a safety flap is arranged on the saw, which covers the cutting area when the saw blade penetrates into the cutting area. The user is thus protected from injuries to the upper extremities and manual access to the safety-relevant area of the saw is made impossible or can only take place if the saw is used improperly.

A disadvantage of the sawing device known from the prior art is that the safety flap must be closed manually in order to bring the sawing device into a sawing position in which the sawing of the wood is possible. In practice, this version means an increased effort for operation and concentration for the operator, since the safety flap must be operated or closed continuously.

The object of the invention is therefore to provide a sawing device that meets the current safety requirements for sawing devices and at the same time enables the operating process without additional effort such as closing a safety flap.

The invention solves this problem in a sawing device for cutting wood comprising at least one saw blade and a workpiece holder with a cutting space for inserting sawn material, which is movably arranged between a rest position remote from the cutting edge of the saw blade and a sawing position close to the cutting edge of the saw blade, in particular pivotable or displaceable, and on which a protective covering for at least partially covering the cutting space is arranged, the access to the cutting space being at least partially permanently covered by the protective covering both in the rest position and in the sawing position, with the characterizing features of patent claim 1 ,

According to the invention it is provided that the protective cover is at least partially displaceable along the longitudinal extent of the cutting space.

The protective cover covers both in the rest position and in the sawing position access to the cutting area from above, or along its longitudinal extent, at least partially permanently, so that an unintentional intervention in the saw blade or a risk of injury from the sawed material in the cutting area is excluded. It is easy to load the workpiece holder laterally or along the front of the cutting area

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AT 521 147 B1 2019-11-15 Austrian patent office possible with material to be cut.

This embodiment of a sawing device according to the invention on the one hand fulfills the safety criteria specified in the standard EN 1870-6: 2018 by the protective covering, while at the same time the operating process when cutting sawdust is particularly simple for the user and does not involve additional operating effort such as, for example the closing of a safety flap is connected. The protective covering effectively protects the user of a sawing device according to the invention or his fingers and hands from unintentional injury from the saw blade or from the material to be cut in the cutting room.

In order to ensure that a user of the sawing device cannot inadvertently bring it into the sawing position, for example while equipping the workpiece holder with sawing material, it can be provided that the protective cladding is reversible from a starting position into a position with less coverage of the starting position Cutting room can be transferred, the workpiece holder can only be brought into the sawing position in the starting position of the protective cover.

A particularly simple construction of the protective covering can be ensured in a sawing device according to the invention if the protective covering is made in one piece.

In order to provide a particularly easy-to-use protective cladding that can be pressed aside, for example, during the assembly of the workpiece holder with wood with the arm or hand, it can be provided that the protective cladding is made in two or more parts, wherein at least one part of the protective cladding arranged on the discharge side or on a removal side for the removal of the cut sawdust or displaceably and at least one further part of the protective cladding arranged on the feed side or on a feed side opposite the removal side for the supply of the sawdust to be cut is slidably arranged on the workpiece holder is.

A structurally simple construction of such a protective covering can be provided if the protective covering is made in two parts, a first part of the protective covering arranged on the discharge side and a second part of the protective covering arranged on the supply side being slidably arranged on the workpiece holder, the second part is slidable above or below the first part.

Thus, the workpiece holder can have a feed side for the supply of the sawing material to be cut and a removal side opposite the feed side for the removal of the cut sawing material and the protective cladding can, for example, be made in two parts, a first, non-displaceable part of the protective cladding on the workpiece holder is arranged starting from the saw blade in the direction of the removal side and a second part of the protective covering can be displaced from an initial position arranged starting from the saw blade in the direction of the feeding side into a feeding position in which the second part of the protective covering is arranged above or below the first part.

In order to be able to reliably secure the sawdust in the workpiece holder, so that rotation of the sawdust during cutting is avoided, it can be provided that the workpiece holder comprises a support part on the user side and a support part on the saw side, in particular providing that the user-side support part and the saw-side support part of the workpiece holder are arranged at an angle of 70 to 90 ° to one another.

The design of the workpiece holder with two support surfaces for the saw material, which are arranged at an angle to each other, effectively prevents movement of the material to be cut during the sawing operation, so that the user is not exposed to any danger from rotating saw material.

[0018] It can be particularly advantageous with such protective cladding if the

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Protective cladding is guided at least partially displaceably along a guide rail, in particular on the user-side support part of the workpiece holder, along the longitudinal extent of the cutting space. In this case, it is ensured that the user of the sawing device can easily move or move the protective covering along the guide rail if, for example, Would like to bring sawed material into the cutting area.

Direct access to the saw blade, both during cutting and in the rest position, can be prevented if a saw blade cover covering the saw blade is provided.

In order to rule out any danger to the user of the sawing device from the saw blade rotating during operation, it can be provided that the workpiece holder can only be brought into the sawing position in the starting position of a displaceable, in particular the second, part of the protective cladding, in particular providing that when the displaceable part, in particular the second part, of the protective cover is moved or moved, a mechanical and / or electrical lock is formed, in particular between the protective cover and the saw blade cover, so that the workpiece holder cannot be brought into the sawing position. The locking prevents the user from bringing the workpiece holder into the sawing position if the protective cover is not in the starting position or if the user is loading the workpiece holder with sawing material and his arms or hands are in the cutting area.

A particularly simple operation of the protective covering can be made possible if a resetting means, in particular a spring, is provided for an independent resetting of the protective covering, in particular the second part of the protective covering, into the starting position. In this embodiment of the protective cladding, the user advantageously does not need to return it manually to the starting position in order to be able to bring the workpiece holder into the sawing position.

A particularly long-lasting, robust design of the protective covering can be ensured if the protective covering is transparent and / or consists of impact and / or impact-resistant, in particular heat-resistant, material.

A particularly safe embodiment of the sawing device, in which access to the saw blade is made more difficult, can be provided if the distance between the saw blade and the end of the second part of the protective cover remote from the saw blade is 250 mm or larger in the starting position and / or the distance between the saw blade and the end of the first part of the protective cover that is remote from the saw blade is 230 mm or greater in the starting position. Such an embodiment of the sawing device advantageously ensures compliance with the safety distances specified in the guidelines.

A particularly safe transfer of the workpiece holder into the sawing position, which is accompanied by simple operation and the greatest possible protection of the user, can be ensured if a cut opening is arranged on the workpiece holder, in particular on the saw-side support part of the workpiece holder, in the cutting plane of the saw blade , wherein the saw blade can be introduced into the cutting space through the cut opening in the sawing position.

A particularly effective protection of the user against injuries from the saw blade can be ensured if a saw blade cladding with a passage gap is arranged on the workpiece holder, in particular on the saw-side support part of the workpiece holder. A particularly good protective effect is achieved if the saw blade cladding is aligned normal to the cutting plane of the saw blade and the saw blade is covered in the rest position by the saw blade cladding in the direction of the cutting space and can be introduced into the cutting space through the passage gap in the sawing position. With such a configuration of the protective cladding, it is ensured that the user cannot inadvertently intervene in the saw blade even in the rest position of the workpiece holder if he

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AT 521 147 B1 2019-11-15 Austrian patent office

For example, brings saw material into the cutting area and moves your hands into the cutting area.

In order to ensure effortless sawing of material to be cut, while at the same time avoiding any possible undesirable wear of the saw blade, it can be provided that the workpiece holder can be brought from the rest position into the sawing position with a linear movement, the direction of movement of the workpiece holder being parallel to Cutting plane of the saw blade or that the workpiece holder can be brought from the rest position into the sawing position with a pivoting movement, the pivot axis of the workpiece holder being oriented normal to the cutting plane of the saw blade. Particular ease of use is achieved if a further reset means, in particular a further spring, is provided for an independent return of the workpiece holder to the rest position. A sawing device according to the invention can thus advantageously be equipped, for example, with a pivotable rocker or a linearly displaceable roller table as the workpiece holder. The arrangement of a restoring means advantageously ensures that the user of the sawing device does not have to manually transfer the workpiece holder from the sawing position into the rest position.

In order to ensure that a sufficient, guideline-compliant distance between the sawdust and the saw blade prevails even in the rest position of the workpiece holder, it can be provided that in the rest position of the workpiece holder the distance between the sawdust in the cutting space and the saw blade 50 mm or is bigger.

A particularly variable use of a sawing device according to the invention can be ensured by providing an electric motor with a direct drive or an electric motor with a V-belt drive or an internal combustion engine with a V-belt or a pto shaft gear with a V-belt as the saw blade drive of the saw blade, optionally with a between the saw blade drive and the saw blade Gear is provided.

In order to enable an effective cutting of various types of wood or saw material geometries, it can be provided that at least one circular saw blade or jigsaw blade or band saw blade is provided as the saw blade.

To further simplify the operation of a sawing device, it can be provided that a device for the removal of cut material, in particular a conveyor belt, is arranged on the removal side of the workpiece holder.

Further advantages and refinements of the invention result from the description and the accompanying drawings.

Particularly advantageous but not restrictive embodiments of the invention are shown schematically below with reference to the accompanying drawings and described by way of example with reference to the drawings.

In the following show:

Figure 1 2 shows a first oblique view of an exemplary embodiment of the invention in the rest position with the protective covering in the starting position, Figure 2 Fig. 3 1 with the protective cover in the feed position, a second inclined view of the first embodiment of the invention with the protective cover in the starting position, Fig. 4 Fig. 5 the second oblique view with the protective cover in the feed position, a third oblique view of the first embodiment with the workpiece holder in the sawing position, Fig. 6a 2 shows a side view of the first exemplary embodiment with the workpiece holder in the rest position, Figure 6b a detailed view of the protective cover in the rest position, and

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AT 521 147 B1 2019-11-15 Austrian Patent Office [0041] FIG. 7 shows a front view of the first exemplary embodiment with the workpiece holder in the sawing position and the protective cover in the starting position.

Figures 1 to 7 show a first embodiment of a sawing device according to the invention for cutting wood. The sawing device is a rocking saw. The sawing device comprises a fixedly arranged on the sawing device, i.e. not displaceable or tiltable, saw blade 3 and a workpiece holder 1 with a cutting space 13 for inserting sawdust. The workpiece holder 1 is movably arranged or pivotable between a rest position remote from the saw blade 3 or the cutting edge of the saw blade 3 and a saw position close to the saw blade 3. In the exemplary embodiment shown, the longitudinal axis of the workpiece holder 1 is oriented normal to the cutting plane of the saw blade 3 in the rest position and in the sawing position.

To protect the user of the sawing device from injury by the saw blade 3, a protective covering 2 is arranged on the workpiece holder 1 on the sawing device, which serves to at least partially cover the cutting space 13. The protective cladding 2 at least partially permanently covers the access to the cutting space 13 along its longitudinal extent by the protective cladding 2, both in the rest position and in the sawing position.

The protective covering 2 is made in two parts in the exemplary embodiment shown and has a first non-displaceable part 21 and a second displaceable part 22. In the exemplary embodiment shown, the workpiece holder 1 has a feed side 14 for the feed of the sawing material to be cut and a removal side 15 for the removal of the cut sawing material, which is opposite the feed side 14.

The first, non-displaceable, part 21 of the protective covering 2 is arranged on the workpiece holder 1 starting from the saw blade in the direction of the removal side 15. The second displaceable part 22 of the protective covering can be displaced from an initial position (see FIG. 1), starting from the saw blade 3 in the direction of the feed side 14, into a feed position (see FIG. 2), in which the second part 22 of the protective covering 2 over the first Part 21 of the protective cover 2 is moved. Alternatively, the second part 22 of the protective covering 2 can also be displaceable under the first part 21 of the protective covering 2 or the second part 22 of the protective covering 2 can be arranged in a stationary manner on the workpiece holder 1 while the first part 21 is designed to be displaceable.

This configuration enables the user of the sawing device, for example, if he brings a piece of wood over the feed side 14 into the cutting space 13 of the workpiece holder 1, the protective cover 2 does not have to be moved initially, but rather can simply be pushed into the cutting space 13 ,

In the exemplary embodiment shown, a stop for the sawing material is provided on the removal side 15, so that the user can push the sawing material to the stop in the rest position of the workpiece holder 1 and thus simply position the sawing material in the workpiece holder 1 and receive pieces of wood of uniform length can. In order to push the material to be sawn further into the cutting space 13, the user of the sawing device can simply press the arm against the second part 22 of the protective covering 2, for example, and push it over the first part 21.

The embodiment shown in Figures 1 to 7 is a rocking saw device in which the workpiece holder 1 comprises a user-side support part 10 and a saw-side support part 11 and the user-side support part 10 and the saw-side support part 11 at an angle, in particular from 70 to 90 °, are arranged to each other. The workpiece holder 1 further has two foot parts 12. This configuration of the sawing device ensures that the sawdust rests stably on the two support parts or surfaces of the workpiece holder 1, whereby movement of the sawdust is prevented as far as possible. This precludes dangerous turning of the sawdust during the cutting in the workpiece holder 1.

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AT 521 147 B1 2019-11-15 Austrian Patent Office [0049] In the exemplary embodiment shown, the sawing device further comprises a saw blade cover 6 covering the saw blade 3 from above. The saw blade cover 6 serves to prevent a user of the sawing device from entering the saw blade 3 from above can grip, which would pose a considerable risk of limb amputation, particularly when the saw device is in operation.

In the exemplary embodiment shown, as can be seen in FIG. 2, a cutting opening 17 is arranged in the workpiece holder 1 or on the saw-side support part 11 of the workpiece holder 1 in the cutting plane of the saw blade 3, the saw blade 3 in the sawing position through the cutting opening 17 can be introduced into the cutting space 13 by pivoting the workpiece holder 1.

Furthermore, a saw blade cladding 5 with a passage gap 51 is arranged on the workpiece holder 1 or on the saw-side support part 11 of the workpiece holder 1 (see FIG. 2). The saw blade cover 5 is oriented normal to the cutting plane of the saw blade 3 and the saw blade 3 is covered in the rest position by the saw blade cover 5 in the direction of the cutting space 13.

To protect the user, the workpiece holder 1 can only be brought into the sawing position in the starting position of the protective covering 2. If the protective covering 2 is displaced from the initial position or the cutting space 13 is covered less along its longitudinal extent than in the initial position, the workpiece holder cannot be brought into the sawing position.

In the exemplary embodiment shown, the workpiece holder cannot be brought into the sawing position when the second part 22 of the protective covering 2 is moved, in particular, manually, since a locking mechanism is formed.

This locking is shown in Figures 2 and 4 in detail. It can be seen here that in the exemplary embodiment shown, when the second part 22 of the protective cover 2 is moved from the starting position, a mechanical lock is formed between the protective cover 2 and the saw blade cover 6, so that the workpiece holder 1 cannot be brought into the sawing position. Alternatively or in addition, any other or further e.g. electrical, locking may be provided.

Is the protective cover 2 in the starting position, the user can, for example, by pressing against a handle 16 attached to the workpiece holder 1, bring the workpiece holder 1 from the rest position into the sawing position and cut the sawing material located in the cutting space 13. In the sawing position, the saw blade 3 passes through the passage gap 51 into the cutting space 13, so that the sawn material is cut in the cutting space 13.

In the exemplary embodiment shown, the workpiece holder 1 can be moved from the rest position into the sawing position with a pivoting movement, the pivot axis of the workpiece holder 1 being oriented normally to the cutting plane of the saw blade 3. This means that the workpiece holder 1 is pivotally mounted about a pivot axis, which in the exemplary embodiment shown is aligned parallel to the axis of rotation of the saw blade 3. The bottom end of the foot parts 12 of the workpiece holder 1 is pivotally mounted on the sawing device.

Figures 1, 3, 6a and 6b show views of the sawing device with the workpiece holder 1 in the rest position. The protective cladding 2 is in the initial position, so that a pivoting of the workpiece holder 1 into the sawing position would be possible for a user of the sawing device.

As can be seen in particular in Fig. 3, the saw blade cover 6 engages in the starting position of the protective cover 2 in the embodiment shown in a recess 23 arranged in the first part 21 of the protective cover 2, which lies in the cutting plane of the saw blade 3. This recess 23 in the first part 21 of the protective covering 2 is in the ge ez 20th

AT 521 147 B1 2019-11-15 Austrian patent office showed exemplary embodiments arranged for the cut opening 17 of the workpiece holder 1 and for the passage gap 51 in the saw blade cladding 5 that the saw blade 3 easily swings into the cutting space 13 when the workpiece holder 1 is pivoted from the rest position into the sawing position the workpiece holder 1 can be inserted.

The second part 22 of the protective cladding 2 is arranged in the starting position for the first part 21 of the protective cladding 2 such that the access to the cutting space 13 along its longitudinal extent is permanently covered in a danger area around the saw blade 3, the recess 23 in the first part 21 of the protective covering 2, however, is not covered by the second part 22 of the protective covering 2. This configuration of the protective cover 2 ensures the greatest possible protection of the user of the sawing device against injuries from the saw blade 3, since an unintentional intervention in the saw blade 3 by a cooperation of the saw blade cover 6, the protective cover 2 and the saw blade cover 5 and by the user-side support part 10 of the workpiece holder 1 is prevented.

FIGS. 5 and 7 show views of the sawing device in which the workpiece holder 1 is in the sawing position. It can be seen that in the sawing position the saw blade 3 penetrates into the cutting space 13 through the passage gap 51 in the saw blade cladding 5, the cut opening 17 and the recess 23 in the first part 21 of the protective cladding 2, while the saw blade cover 6 in the area of the receptacle in the first Part 21 of the protective covering 2 slides over the protective covering 2.

In the end position of the sawing position, in which the saw blade 3 has completely cut through the sawdust, the workpiece holder 1 is stopped in its movement by a stop, so that a further pivoting of the workpiece holder 1 in the direction of the saw blade 3 is no longer possible.

In order to make it easier for the user of the sawing device to operate the protective covering 2, in the exemplary embodiment shown a reset means, which in the exemplary embodiment is a spring, is arranged for an independent return of the second part 22 of the protective covering 2 to the starting position, so that the user does not have to manually return the second part 22 to the starting position. Alternatively or additionally, hydraulic or elastic return means can be provided.

If, for example, the user would like to push a piece of sawdust that has already been partially sawn off further into the cutting space 13 of the workpiece holder 1, he can simply press for example with the arm against the movable second part 22 of the protective device 2, so that the latter passes over the first part 21 of the protective device 2 is moved and the user can push the sawed material for example up to the stop on the removal side 15 of the workpiece holder 1.

If the second part 22 of the protective device 2 is displaced from the initial position, the saw blade cover 6 engages in a bar arranged on the second part 22 in the exemplary embodiment shown (see FIGS. 2 and 4) and a mechanical lock is formed, so that the User can no longer pivot the workpiece holder 1 from the rest position into the sawing position. In the exemplary embodiment shown, pivoting into the sawing position is only possible again when the second part 22 of the protective covering 2 has returned to the starting position.

In order to ensure a particularly simple handling for the user of the saw, a further restoring means, for example another spring, is provided in the exemplary embodiment shown for an independent return of the workpiece holder 1 to the rest position. In the exemplary embodiment shown, the further restoring means or the further spring is mounted on the sawing device in such a way that the user of the sawing device must apply slight pressure when transferring the workpiece holder 1 into the sawing position, so that the spring is tensioned. After cutting the material to be sawn, the workpiece holder 1 automatically returns to the rest position due to the spring action when the user

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AT 521 147 B1 2019-11-15 Austrian patent office zer reduced the pressure on the workpiece holder 1.

The further restoring means or the further spring for returning the workpiece holder 1 to the rest position is tensioned in the end position of the sawing position, so that the user only needs to reduce or cancel the pressure on the workpiece holder 1 to reset the workpiece holder 1 to the rest position. In the exemplary embodiment shown, a handle 16 is arranged on the workpiece holder 1 or on the user-side part 10 of the workpiece holder 1 for particularly simple operation of the workpiece holder 1 or simple pivoting.

A further simplification of operation results in the exemplary embodiment shown in that a guide rail is arranged on the user-side support part 10 of the workpiece holder 1, along which the protective cladding 2 or the second part 22 of the protective cladding 2 can simply be displaced along the longitudinal extent of the cutting space 13 is.

Has the user of the sawing device, as described above, cut a piece of sawdust, for example a log, this falls in the end position of the sawing position in the embodiment shown directly onto a conveyor belt 7 arranged on the removal side 15 of the workpiece holder 1, which is for removal of the cut saw. As an alternative to this, the user of the sawing device can simply remove the cut sawdust on the removal side of the workpiece holder 1 when the workpiece holder 1 is in the rest position.

In order to ensure the greatest possible protection for a user of the saw device against unintentional intervention in the saw blade 3, in the saw device according to the invention, as shown in FIGS. 1 to 7, in the starting position of the protective cover 2, the distance between the saw blade 3 and the end of the second part 22 distant from the saw blade 3 22 250 mm, the distance between the saw blade 3 and the end of the first part 21 distant from the saw blade 3 and the distance between the sawn material in the cutting space 13 and the saw blade 3 in the rest position of the workpiece holder 1 50 mm.

This configuration of the sawing device ensures that the distance between the hands of the user and the saw blade 3 is sufficiently large in every position of the workpiece holder 1 and that the safety requirements for sawing devices currently defined by the standard are met.

In all conceivable embodiments of a sawing device according to the invention, the protective cladding 2 can also be made in one piece and movable, in particular displaceable. Such a protective cladding 2 can be, for example, a foldable cladding that can be folded back or pushed in the direction of the removal side 15 for simple loading of the workpiece holder 1 with sawing material. Subsequently, the folded one-piece protective covering 2 can independently e.g. return to the starting position by means of a reset means or be pulled into the starting position by the user. In this case, the cladding can have an opening through which the saw blade 3 can be introduced into the cutting space 13 in the sawing position.

Alternatively, the protective cladding 2 in all embodiments of a sawing device according to the invention can also be made in several parts, at least one part of the protective cladding 2 arranged on the discharge side being fixed or movable and at least one further part of the protective cladding 2 arranged on the feed side being arranged movably on the workpiece holder 1, wherein preferably all parts of the protective covering 2 can be moved above or below one another. In order to make it easier for the user of such a sawing device to load the workpiece holder 1 with sawing material, the at least one further part of the protective covering 2 arranged on the feed side can be moved over or under the at least one part arranged on the discharge side.

In such multi-part configurations of the protective cladding 2, it is possible, for example, that the workpiece holder 1 starts from the saw blade 3 in the direction of the closing

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AT 521 147 B1 2019-11-15 Austrian patent office leading page 14, for example, two or more parts of the protective covering 2 are arranged. These can be arranged in a fan-like manner above or below one another, in particular displaceable, so that they can be moved together or separately from the starting position into a feed position. In the feed position, the other parts of the protective cladding 2 can be displaced above or below the at least part of the protective cladding 2, which is arranged on the workpiece holder 1 from the saw blade 2 in the direction of the removal side 15, for example in a stationary manner.

In all embodiments of a sawing device according to the invention, the workpiece holder 1 can furthermore be brought into the sawing position only in the starting position of the at least one movable part, in particular the second part 22, of the protective covering 2. When, for example, the at least one movable part of the protective covering 2 is moved manually from the starting position, a lock can be formed, as described above, so that the workpiece holder 1 cannot be brought into the sawing position.

This lock can not only be, as already mentioned above, a mechanical lock, but alternatively or additionally, an electrical lock can also be formed. Such locking can be achieved, for example, if, for example, an electrical contact is interrupted when the protective covering 2 is in the feed position, while the electrical contact is made when the protective covering 2 is in the starting position. Thus, the workpiece holder 1 can only be brought from the rest position into the sawing position when the electrical contact has been made.

In a sawing device according to the invention, a workpiece holder 1 can also be provided instead of a pivotable workpiece holder 1, such as a rocker, which is designed as a roller table. In this case, the workpiece holder 1 or the roller table can be brought from the rest position into the sawing position with a linear movement, the direction of movement of the roller table being oriented parallel to the cutting plane of the saw blade 3.

In this case, a further reset means, in particular a further spring, can also be provided for simple operation and an independent return of the workpiece holder 1 or the roller table to the rest position. In this case, the user of the sawing device presses against the roller table in order to bring it from the rest position into the sawing position, whereby he has to overcome the spring force and the spring is tensioned. Once the user has cut the material to be sawn, he can reduce the pressure on the workpiece holder 1, the spring contracts and the roller table automatically returns to the rest position.

In such a saw device equipped with a workpiece holder 1 designed as a roller table, the protective cladding 2 can, for example, be in one piece or two or two pieces. Multi-part protective cladding 2 can be designed, which is in particular partially slidable. An example of such a protective cladding 2 would be a configuration in the form of a semi-hollow cuboid or semi-hollow cylinder jacket, in which the sawdust can be inserted or inserted laterally and which can be supplemented with a saw blade cladding 5 with a passage gap 51 on the saw side.

In the workpiece holder 1 or in the roller table, a cutting opening 17 can also be arranged in the cutting plane of the saw blade 3 in such a sawing device, wherein the saw blade 3 can be introduced into the cutting space 13 through the cutting opening 17 in the sawing position.

The embodiment shown in Figures 1 to 7 of a sawing device according to the invention has as a saw blade drive 8 for the saw blade 3 via an electric motor with direct drive. As an alternative to this, a sawing device according to the invention can also comprise an electric motor with a V-belt drive or an internal combustion engine with a V-belt or a power take-off gear with a V-belt, optionally between the saw blade

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AT 521 147 B1 2019-11-15 Austrian patent office the drive 8 and the saw blade 3 a gear is provided.

As an alternative to the circular saw blade in the exemplary embodiment shown, a sawing device according to the invention can have several circular saw blades or at least one jigsaw blade or band saw blade as the saw blade 3.

Claims (16)

1. sawing device for cutting wood comprising at least one saw blade (3) and a workpiece holder (1) with a cutting space (13) for inserting sawdust, the workpiece holder (1) being movably arranged, in particular pivotable or displaceable, between a rest position remote from the cutting edge of the saw blade (3) and a sawing position close to the cutting edge of the saw blade (3), a protective covering (2) for at least partially covering the cutting space (13) is arranged on the workpiece holder (1), -wherein both in the rest position and in the sawing position the access to the cutting space (13) is at least partially permanently covered by the protective covering (2), characterized in that the protective covering (2) is at least partially displaceable along the longitudinal extent of the cutting space (13) is. 2. Sawing device according to claim 1, characterized in that the protective covering (2) can be transferred reversibly from a starting position into a position with a lower coverage of the cutting space (13) compared to the starting position, the workpiece holder (1) only in the starting position of the protective covering (2) can be brought into the sawing position. 3. Sawing device according to claim 1 or 2, characterized in that the protective covering (2) is made in one piece. 4. Sawing device according to claim 1 or 2, characterized in that the protective cladding (2) is made in two or more parts, at least one part of the protective cladding (2) arranged on the discharge side or on a removal side (15) for the removal of the cut material to be sawn. stationary or displaceable and at least one further part of the protective casing (2) arranged on the supply side or on a supply side (14) opposite the removal side (15) for the supply of the sawdust to be cut is slidably arranged on the workpiece holder (1), in particular being provided that the protective covering (2) is made in two parts, a first part (21) of the protective covering (2) arranged on the discharge side and a second part (22) of the protective covering (2) arranged on the supply side being displaceably arranged on the workpiece holder (1), the second part (22) being displaceable above or below the first part (21). 5. Sawing device according to one of the preceding claims, characterized in that the workpiece holder (1) comprises a user-side support part (10) and a saw-side support part (11), it being provided in particular that the user-side support part (10) and the saw-side support part (11) the workpiece holder (1) are arranged at an angle of 70 to 90 ° to one another, - In particular that the protective covering (2) is guided at least partially displaceably along a guide rail, in particular on the user-side support part (10) of the workpiece holder (1), along the longitudinal extent of the cutting space (13). 6. Sawing device according to one of the preceding claims, characterized in that a saw blade cover (6) covering the saw blade (3) is provided. 7. Sawing device according to one of claims 2 to 6, characterized in that the workpiece holder (1) can only be brought into the sawing position in the starting position of a displaceable, in particular the second, part (22) of the protective cover (2), in particular being provided that when the displaceable part, in particular the second part (22), is moved or moved, the protective cover (2) from the starting position is designed to be mechanically and / or electrically locked, in particular between the protective cover (2) and the saw blade cover (6) , so that the workpiece holder (1) cannot be brought into the sawing position. 11/20 AT 521 147 B1 2019-11-15 Austrian patent office 8. Sawing device according to one of the preceding claims, characterized in that a resetting means, in particular a spring, is provided for an independent resetting of the protective covering (2), in particular the second part (22) of the protective covering (2), into the starting position and / or that the protective covering (2) is transparent and / or consists of impact and / or impact-resistant, in particular heat-resistant, material. 9. Sawing device according to one of the preceding claims, characterized in that - The distance between the saw blade (3) and the end of the second part (22) of the protective cover (2) remote from the saw blade (3) is 250 mm or larger in the starting position and / or - The distance between the saw blade (3) and the end of the first part (21) of the protective cover (2) remote from the saw blade (3) is 230 mm or larger in the starting position. 10. Sawing device according to one of the preceding claims, characterized in that a cut opening (17) is arranged on the workpiece holder (1), in particular on the saw-side support part (11) of the workpiece holder (1), in the cutting plane of the saw blade (3), wherein the saw blade (3) can be inserted into the cutting space (13) through the cut opening (17) in the sawing position. 11. Sawing device according to one of the preceding claims, characterized in that a saw blade cover (5) with a passage gap (51) is arranged on the workpiece holder (1), in particular on the saw-side support part (11) of the workpiece holder (1), -wherein the saw blade cover (5) is aligned normal to the cutting plane of the saw blade (3) and -wherein the saw blade (3) in the rest position is covered by the saw blade cladding (5) in the direction of the cutting space (13) and the saw blade (3) in the sawing position can be introduced into the cutting space (13) through the passage gap (51). 12. Sawing device according to one of the preceding claims, characterized in that the workpiece holder (1) can be brought from the rest position into the sawing position with a linear movement, the direction of movement of the workpiece holder (1) being parallel to the cutting plane of the saw blade (3) or -that the workpiece holder (1) can be moved from the rest position into the sawing position with a pivoting movement, the pivot axis of the workpiece holder (1) being oriented normal to the cutting plane of the saw blade (3), in particular that a further resetting means, in particular a further spring, is provided for an independent return of the workpiece holder (1) to the rest position. 13. Sawing device according to one of the preceding claims, characterized in that in the rest position of the workpiece holder (1) the distance between the material to be sawn in the cutting space (13) and the saw blade (3) is 50 mm or larger. 14. Sawing device according to one of the preceding claims, characterized in that the saw blade drive (8) of the saw blade (3) is an electric motor with direct drive or an electric motor with V-belt drive or an internal combustion engine with V-belt or a pto shaft gear with V-belt, optionally between the saw-blade drive (8) and the saw blade (3) a gear is provided. 15. Sawing device according to one of the preceding claims, characterized in that at least one circular saw blade or jigsaw blade or band saw blade is provided as the saw blade (3). 12/20 AT 521 147 B1 2019-11-15 Austrian patent office 16. Sawing device according to one of the preceding claims, characterized in that on the removal side of the workpiece holder (1) a device for removing cut saw material, in particular a conveyor belt (7) is arranged.